In 1.6.4 this code for an image variant:

<Image imageID="&rsBattleArenaExtra;" imageX="0" imageY="0" imageWidth="0" imageHeight="0"/>

resulted in no image appearing (as was desired).
In 1.7 and 1.8a1 it returns the whole image.
Line 200 in HSCompatibility.xml has this code.

Image: 1.6.4 on the left; same code in 1.7 and 1.8a1 on right.

Changing it to this to produces no (visible) image in 1.7 and 1.8a1:

<Image imageID="&rsBattleArenaExtra;" imageX="0" imageY="0" imageWidth="1" imageHeight="1"/>

Seen in The Network ReRepaired prison in New Alcatraz system.

https://forums.kronosaur.com/viewtopic.php?f=25&t=8040